Grade-Specific Machining Parameters
Confirm material grade, delivery condition, finishing requirements and supporting records.
Stainless Steel CNC
Turning Parts
CNCPioneer is an IATF 16949 and AS9100D certified manufacturer of custom stainless steel CNC turning parts for valve bodies, valve cores, shafts, hygienic fittings, sensor housings and industrial hardware.
IATF 16949 & AS9100D quality systems
Material and inspection scope reviewed with your drawing
Prototype and repeat-production enquiries
Finishing and documentation agreed with the order
DFMDrawing & process review
QCAgreed inspection plan
Stainless Steel CNC Turning Parts: Product Overview
Custom stainless steel CNC turning parts are rotational components machined from corrosion-resistant and high-strength grades for valves, fluid fittings, shafts, hygienic equipment, sensors and industrial hardware.
- Grade-specific turning parameters and coolant controlEach stainless grade receives its own feed, speed, tooling and coolant strategy.
- ASTM A967 passivationReview critical dimensions, datums and mating features and functional requirements before defining the process.
- SII XRF material verificationConfirm material grade, delivery condition, finishing requirements and supporting records.
- Material, passivation and dimensional verificationConfirm material grade, delivery condition, finishing requirements and supporting records.
Why CNCPioneer for Stainless Steel CNC Turning Parts?
Coordinate geometry, material, finishing and inspection around the part's intended function.
Swiss CNC Guide Bushing
Plan support and setup around critical diameters, datums and mating interfaces.
Turned and Milled Stainless Features
Specify journals, bores, threads and cross-features using functional datums. Review stock condition, cutting access and chip removal before agreeing the operation sequence.
Stainless Surface Treatment
Identify whether passivation, electropolishing or another finish is required. State controlled surfaces, masking and the final dimensional acceptance condition with the drawing.
Blacken Stainless
Stainless parts requiring black, non-reflective finish (military optical hardware, tactical instruments, architectural hardware, precision mechanisms) need blackening that preserves corrosion resistance and dimensional accuracy.
Quality Records for the Order
List material certificates, dimensional reports and any customer-specific approval records. Agree document content and inspection coverage for the actual stainless steel components.
Stainless Steel CNC Turning Parts We Manufacture
Explore representative configurations and share your drawing for a product-specific review.
Valve Cores
Ball valve core (420 hardened or 316L): OD ±0.003mm h6 from CBN precision grinding; sphericity ±0.003mm at 12 measurement positions; port bore Ra ≤0.4μm; stem flat angular position ±0.010°; chrome or Ni-P surface for hardened 420; passivation + electropolish for 316L.
Valve Bodies
Ball valve body (Ø15–100mm, PN16–PN40): body bore ±0.010mm Ra 0.8μm; BSP/NPT/metric ports ±0.005mm; stem bore ±0.005mm perpendicular to ball bore 0.010mm; O-ring groove ±0.020mm width / ±0.010mm depth; gland nut thread ±0.005mm.
Precision Shafts
Precision Shafts machined to your drawing. Confirm material, functional dimensions and finish before production.
Hygienic Fittings
Hygienic Fittings machined to your drawing. Confirm material, functional dimensions and finish before production.
Automotive Stainless Brake
Exhaust sensor boss (316Ti or 304): M18×1.5 external thread ±0.005mm; bore ID ±0.020mm; face perpendicularity 0.010mm; ASTM A967 passivation.
Sensor Housings
Sensor Housings machined to your drawing. Confirm material, functional dimensions and finish before production.
Industries & Applications
Stainless steel turned components for automotive, aerospace, medical, oil and gas, robotics and semiconductor equipment. Match the material, sealing features, mating fits and inspection requirements to each application.
Automotive
Stainless steel sensor housings, valve components and precision shafts for vehicle assemblies. Review threads, locating diameters, corrosion protection and mating fits against the approved drawing.
Explore automotive machining
Aerospace
Turned shafts, sleeves, threaded fittings and actuator hardware for aircraft equipment. Define material condition, concentric features, surface finish and the inspection records required for your program.
Explore aerospace machining
Medical Devices
Instrument shafts, connector bodies and equipment housings machined to medical device drawings. Specify material grade, burr limits, cleanable surfaces and the assembly interfaces that control fit.
Explore medical machining
Oil & Gas
Valve bodies, valve cores, threaded fittings and instrumentation housings for energy equipment. Review process media, sealing features, pressure-related drawing requirements and material traceability before production.
Explore oil & gas machining
Robotics & Automation
Joint shafts, precision sleeves, locating pins and sensor housings for robot assemblies. Control bearing fits, concentricity and mounting datums, with finishing allowances defined for the mating components.
Explore robotics machining
Semiconductor
Vacuum fittings, gas valve bodies and sensor housings for semiconductor equipment. Define stainless grade, sealing surfaces, surface treatment, cleanliness and packaging requirements for the equipment specification.
Explore semiconductor machiningMaterials
Materials for Stainless Steel CNC Turning Parts
Confirm the exact grade, delivery condition and finish compatibility with your drawing.
316L · Dominant Grade · Mo + L-Grade
316L Stainless (UNS S31603)
C ≤0.030% · Cr 16–18% · Ni 10–14% · Mo 2–3% · UTS 485–690 MPa · μ_r ≤1.005.
304 / 304L · Universal · Most Common
304 Stainless (UNS S30400)
Cr 18–20% · Ni 8–10.5% · C ≤0.080% · UTS 515–690 MPa · Non-magnetic.
303 · Free-Machining · Best Machinability
303 Stainless (UNS S30300)
S 0.15–0.35% (free-machining) · Machinability 70–80% (best stainless) · v_c = 180–250 m/min.
17-4PH H900 · Aerospace · 1,170 MPa
17-4PH H900 (UNS S17400)
Cr 15–17.5% · Ni 3–5% · Cu 3–5% · HRC 44–47 H900 · UTS 1,170–1,310 MPa · Magnetic.
420 / 440C · Hardened · Valve Balls
420 / 440C Martensitic
Confirm the exact material grade, condition, heat-treatment requirements and certificates against the approved drawing.
Finish selection
Surface Treatments for Stainless Steel CNC Turning Parts
Select the finish around the specified material, functional surfaces and service conditions. Confirm process details and acceptance requirements with your drawing.
Corrosion control
ASTM A967 Passivation
CNCPioneer's standard treatment on all 304, 316L, 316Ti, and 303 stainless CNC turning parts — not an optional add-on.
- Best for
- Stainless steel surface requirements
- Specify
- Method, masking & inspection records
Surface finish
Electropolishing
Phosphoric-sulfuric acid EP simultaneously planarizes (50–70% Ra reduction) and creates a chromium-enriched passive oxide superior to passivated-only surfaces.
- Best for
- Functional or hygienic surfaces
- Specify
- Required Ra, geometry & allowance
Finish selection
Blacken Stainless
Black oxide (Fe₃O₄, 1–3μm, flat matte black, <1μm dimensional change) for military hardware, optical instruments, architectural components.
- Best for
- Drawing-specific surface requirements
- Specify
- Process, functional surfaces & acceptance
Production Capacity
Machining resources for drawing review, prototypes and repeat-production programs.
Mill-turnCombined turning & milling
CNCPrototype & batch machining
Inspection & documentation
Quality Control for Stainless Steel CNC Turning Parts
Review material identity, machining datums, functional dimensions and production records for your component.
IATF 16949AS9100D
To drawingCritical dimensions
As agreedInspection scope
Final tolerances, inspection coverage and acceptance criteria are confirmed against your drawing, material and geometry.
Material Verification
- Check
- Specified grade, material condition and lot identity.
- Verify
- Material certificates and agreed identification checks.
- Records
- Material certificates and required traceability records.
Machining Process Control
- Check
- Critical dimensions, datums and mating features.
- Verify
- Drawing datums, setup planning and in-process inspection.
- Records
- Agreed critical-feature and process inspection records.
Dimensional Inspection
- Check
- Functional dimensions, mating features and surface condition.
- Verify
- Suitable measuring equipment and drawing-specific gauges.
- Records
- Dimensional reports and specified finish results.
Production Documentation
- Check
- First-piece approval, production records and delivery requirements.
- Verify
- The inspection plan and customer approval process.
- Records
- Agreed document pack, including PPAP or FAIR when required.
Agree Your Quality Document Pack
Confirm the certificates, inspection reports and production records needed for your order when sharing your drawing.
Stainless Steel CNC Turning Parts FAQ
Which Stainless Steel CNC Turning Parts designs can you manufacture?
The product range includes Valve Cores, Valve Bodies, Precision Shafts. Custom geometry is reviewed against the approved drawing.
- Include the mating interfaces, critical datums and expected order quantity.
Which materials can I specify?
Material options include 316L Stainless (UNS S31603), 304 Stainless (UNS S30400), 303 Stainless (UNS S30300). The exact grade and condition should be confirmed for your application.
- Include material certificate, finish and any restricted-substance requirements with your enquiry.
What should I include in the drawing?
Define critical dimensions, datums and mating features, together with datums, tolerances and required surface condition.
- Include a 2D drawing and 3D model where available.
- Identify the dimensions that affect assembly or function.
What finishing and inspection records can be requested?
Finishing options include astm a967 passivation, electropolishing, blacken stainless. Applicability is reviewed against the specified material and geometry.
- Agree material certificates, dimensional reports and any PPAP or FAIR requirements with the order.
How are pricing and lead time confirmed?
Pricing and delivery are confirmed after reviewing the drawing, material availability, quantity, machining route, finishing and inspection scope.
- Prototype and repeat-production schedules are quoted for the specific order.
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Get a Quote for Stainless Steel CNC Turning Parts
Share your drawing or 3D model, material, critical dimensions, finish and order quantity. We’ll review the machining route, inspection scope and delivery requirements.
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